Via the half-life equation we have:
Where A is the amount initially and final amount after some time has passed, t is the time elapsed, h is the half life time and so:
Therefore there will be 2.8125 grams left after 140 seconds.
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Answer:
The partial pressure of the in the final mixture is 200 kPa.
Explanation:
Pressure of nitrogen gas when the two tanks are disconnected = 500 kPa
Pressure of the carbon-dioxide gas when the two tanks are disconnected = 200 kPa
Moles of nitrogen gas =
Moles of carbon dioxide gas =
After connecting both the tanks:
The total pressure of the both gasses in the tank = p = 250 kPa
According to Dalton' law of partial pressure:
Total pressure is equal to sum of partial pressures of all the gases
Partial pressure of nitrogen =
Partial pressure of carbon dioxide=
The partial pressure of the in the final mixture is 200 kPa.